US7218474B2 - Assembly rail corners shaped to reduce shock - Google Patents
Assembly rail corners shaped to reduce shock Download PDFInfo
- Publication number
- US7218474B2 US7218474B2 US10/865,337 US86533704A US7218474B2 US 7218474 B2 US7218474 B2 US 7218474B2 US 86533704 A US86533704 A US 86533704A US 7218474 B2 US7218474 B2 US 7218474B2
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- United States
- Prior art keywords
- assembly
- rail
- mounting
- base
- mounting pad
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/12—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
- G11B33/121—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules the apparatus comprising a single recording/reproducing device
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
Definitions
- the present invention relates generally to protecting delicate mechanical components from damage due to mechanical shock, and more particularly, but not by way of limitation, to protecting discs and heads in disc drives from shock damage.
- Disc drives include delicate mechanical components that can be damaged by shock if a disc drive is dropped on a hard surface during manufacturing, testing or installing the disc drive in a computer.
- disc drives include read/write heads that are mounted on delicate mechanical suspensions to access disc surfaces. When there is mechanical shock or vibration, the read/write heads can bounce on the disc surfaces. The bouncing can damage the disc surfaces, the read/write heads or both.
- disc drives include side rails that protrude from a bottom side of a disc drive housing. It is found that damage to discs or heads from a head slap event is often traceable to shocks that occur when an end of a disc drive is dropped and corners of the metal side rails impact a hard surface. The head temporarily separates from the disc and then slaps back on the disc.
- a method and apparatus are needed to reduce head slap or other damage to mechanical components in a housing with side rails when corners of the side rails impact a hard surface.
- Embodiments of the present invention provide solutions to these and other problems, and offer other advantages over the prior art.
- an assembly that includes a housing having a base.
- a mounting pad is positioned on the base.
- the assembly includes a micromechanical device coupled to the mounting pad.
- the assembly also includes first and second side rails extending from the base to form first and second rail corners.
- the first and second rail corners are subject to striking a surface.
- the first and second rail corners has first and second elevations that are uneven to reduce impacts reaching the micromechanical device.
- FIG. 1 is an oblique view of a disc drive.
- FIGS. 2–4 schematically illustrate a disc drive assembly with rail corners.
- FIG. 5 illustrates a graph of accelerations due to impacts in a drive with rail corners that are not shaped to reduce shock.
- FIGS. 6–8 schematically illustrate a first embodiment of an assembly with an elevational step on a rail corner.
- FIG. 9 illustrates a graph of accelerations due to impact on an assembly with an elevations step on a rail corner.
- FIGS. 10–12 schematically illustrate a second embodiment of an assembly with an elevational step on a rail corner.
- FIG. 13–15 schematically illustrate a third embodiment of an assembly with protruding, cantilevered lugs.
- FIG. 16 illustrates an enlarged oblique view of a the rail corner and lug illustrated in FIGS. 13–15 .
- FIG. 17 illustrates a graph of accelerations due to impacts on assemblies with and without protruding, cantilevered lugs.
- FIG. 18 schematically illustrates a fourth embodiment of an assembly with protruding, cantilevered lugs.
- an assembly includes one or more micromechanical devices that can be damaged by mechanical shock such as head slap.
- a micromechanical device is mounted on a mounting pad on a base of a housing.
- Side rails extend from the base to form rail corners that can be accidentally dropped and strike a surface such as a table.
- the rail corners have elevations that are uneven to reduce head slap damage to the micromechanical assembly when the rail corners drop and strike a surface.
- an elevational step thins one of the rails so that shock impulses from the rails arrive at the mounting pad at different times and tend to interfere and cancel one another.
- the rail corner shape includes cantilevered mounting lugs that protrude or are uneven relative to the adjacent rails to deflect and soften the impacts by spreading the impacts out over time. If needed, the mounting lugs can also have uneven elevations relative to one another. Head slap damage to the micromechanical device from impacts to the rails is reduced.
- FIG. 1 illustrates an oblique view of a disc drive 100 in which embodiments of the present invention are useful.
- Disc drive 100 includes a housing with a base 102 and a top cover (not shown).
- Disc drive 100 further includes a disc pack 106 , which is mounted on a spindle motor (not shown) by a disc clamp 108 .
- Disc pack 106 includes one or more individual discs, which are mounted for co-rotation in a direction indicated by arrow 107 about central axis 109 .
- Each disc surface has an associated disc read/write head slider 110 which is mounted to disc drive 100 for communication with the disc surface.
- FIG. 1 illustrates an oblique view of a disc drive 100 in which embodiments of the present invention are useful.
- Disc drive 100 includes a housing with a base 102 and a top cover (not shown).
- Disc drive 100 further includes a disc pack 106 , which is mounted on a spindle motor (not shown) by a disc clamp
- sliders 110 are supported by suspensions 112 which are in turn attached to track accessing arms 114 of an actuator 116 .
- the actuator 116 shown in FIG. 1 is of the type known as a rotary moving coil actuator and includes a voice coil motor (VCM), shown generally at 118 .
- VCM voice coil motor
- Voice coil motor 118 rotates actuator 116 with its attached read/write heads 110 about a pivot shaft 120 to position read/write heads 110 over a desired data track along an arcuate path 122 between a disc inner diameter 124 and a disc outer diameter 126 .
- Voice coil motor 118 is driven by electronics 130 based on signals generated by read/write heads 110 and a host computer (not shown).
- the pivot shaft 120 mounts to a mounting pad on a base of the disc drive.
- FIGS. 2–4 schematically illustrates a disc drive assembly 200 that does not have rail corners shaped to reduce shock.
- FIG. 2 illustrates a first end view of the disc drive 200 .
- FIG. 3 illustrates a bottom view of the disc drive 200 .
- FIG. 4 illustrates a side view of the disc drive assembly 200 .
- the disc drive assembly 200 includes a die cast housing 202 used for mounting various disc drive components, and a cover 203 .
- the die cast housing 202 includes a base 204 that is generally planar, but includes a through hole 206 for mounting a spindle motor 208 .
- the die cast housing also includes a mounting pad 210 for mounting a hub 211 of a rotary moving voice coil actuator arm 212 .
- the mounting pad 210 (which is illustrated in FIGS. 2–3 with a stippled surface) is a generally round cylindrical protrusion from the base 204 .
- the mounting pad 210 typically has a central bore along an axis 209 for receiving an pivot shaft such as the pivot shaft 120 shown in FIG. 1 .
- a read/write head 214 is suspended on an end of the actuator arm 212 .
- the read/write head 214 is supported by a delicate mechanical suspension on a media surface of a disc 216 that is spun by the spindle motor 208 .
- the read/write head 214 and the disc 216 are subject to head slap damage from shock when the disc drive assembly is dropped on a surface 217 .
- a printed circuit board (PCB) 220 is mounted on a bottom side of the disc drive assembly 200 .
- the spindle motor 208 projects through a round hole 222 in the printed circuit board 220 .
- the mounting pad 210 projects through a round hole 224 in the printed circuit board 220 .
- side rails 230 , 232 extend from the base 204 to form rail corners 234 , 236 with substantially the same corner elevation 240 for both rail corners 234 , 236 .
- the corner elevation 240 is the same on both side rails 230 , 232 so that the disc drive will rest in a level position when the side rails 230 , 232 rest on a level surface.
- Bottom surfaces of the side rails 230 , 232 are substantially flat and level.
- the rails 230 , 232 include grooves 290 , 292 which are cut into the relatively large rails 230 , 232 which are partially effective to reduce impacts.
- grooves 290 , 292 become so thin that they are ineffective in smaller form factor drives such as those with a form factor of 2.5 inch and smaller.
- the grooves can't be used for impact protection and another method is needed to protect smaller form factor drives from impacts.
- the disc drive assembly is pivotally mounted (typically by screws) at holes 250 , 252 and can rotate or pivot around an axis passing through the holes 250 , 252 .
- the rail corners 234 , 236 can impact the level surface 217 at substantially the same time.
- the impacts at the rail corners 234 , 236 are transmitted through the base 204 to the mounting pad 210 .
- the mounting pad 210 transmits the impacts to the hub 211 and the actuator arm 212 .
- the actuator arm 212 vibrates due the impact, and the read/write head 214 , which is mounted on the actuator arm 212 , also vibrates.
- the read/write head 214 vibrates, it bounces on the disc 216 , causing head slap damage to the disc 216 , the read/write head 214 or both, in spite of the presence of the grooves 290 , 292 .
- the grooves 290 , 292 can't be used, and damage becomes more likely.
- FIG. 5 illustrates a graph of accelerations due to impacts in a drive with rail corners that are not shaped to reduce shock.
- a disc drive is mounted in a test fixture on a pivotal axis (for example, along a line passing through mounting holes 250 , 252 in FIGS. 2–4 ). The end of the disc drive is allowed to drop from a horizontal position (such as shown in FIG. 4 ), through an angle of 45 degrees until the rail corners 234 , 236 strike a flat beveled surface (not illustrated).
- Three accelerometers are mounted to the disc drive at locations adjacent the rail corners 234 , 236 and mounting pad 210 and outputs of the accelerometers are scaled for easy comparison and displayed on the oscillogram illustrated in FIG. 5 .
- a vertical axis 270 represents acceleration as sensed by three accelerometers mounted to the disc drive that does not have rail corners that are shaped to reduce shock.
- a horizontal axis 272 represents time in seconds.
- a solid line 274 represents acceleration sensed at a first (left) rail corner.
- a coarsely dashed line 276 represents acceleration sensed at a second (right) rail corner.
- a finely dashed line 278 represents acceleration sensed at a mounting pad (actuator arm pivot).
- FIG. 5 there is are impact (acceleration) peaks 280 , 282 at the rail corners that are essentially simultaneous.
- the impact peaks 280 , 282 travel through a base to the mounting pad and interfere constructively to produce a large impact peak 284 at the mounting pad.
- the large impact peak 284 is large enough to damage a micromechanical device mounted to the mounting pad. As described below in connections with embodiments described in FIGS. 6–18 , this problem with damage to a micromechanical device from bouncing (head slap) is substantially reduced by shaping rail corners to reduce shock.
- FIGS. 6–8 schematically illustrate a first embodiment of an assembly 300 .
- the assembly 300 comprises a housing 302 including a base 304 and a mounting pad 310 on the base 304 adjacent a first end 301 of the assembly 300 .
- a micromechanical device 309 couples via a pivot shaft to the mounting pad 310 .
- the assembly 300 comprises a disc drive assembly, however, assembly 300 can take a variety of forms other than a disc drive assembly, dependent on the application.
- the micromechanical device 309 comprises disc drive components 311 , 312 , 314 316 (discussed below), however, micromechanical device 309 can take a variety of forms other than disc drive components, depending on the application.
- the assembly 300 is pivotally mounted (typically by screws) at holes 351 , 353 and can rotate or pivot around an axis 355 passing through the holes 351 , 353 .
- a hub 311 of a rotary moving voice coil actuator arm 312 is rotationally mounted to the mounting pad 310 .
- a read/write head 314 is suspended on an end of the actuator arm 312 .
- the read/write head 314 is supported on a delicate mechanical suspension on a media surface of a disc 316 that is spun by a spindle motor 308 .
- the read/write head 314 and the disc 316 are subject to damage from shock (head slap) when the disc drive assembly is dropped on a surface 317 .
- the assembly 300 also includes first and second side rails 330 , 332 extending from the base 304 to form first and second rail corners 334 , 336 subject to impacts upon striking a surface.
- the first rail corner 334 is mechanically coupled to the mounting pad 310 through the base 304 along a path 360 with a path length X 1 .
- the second rail corner 336 is mechanically coupled to the mounting pad 310 through the base 304 along a path 362 with a path length X 2 . Impacts travel through the base 304 at the speed of sound in the material used for the base.
- a difference in path length (X 1 ⁇ X 2 ) of 1 millimeter will cause simultaneous impacts at rail corners 334 , 336 to reach the mounting pad separated by a time difference by about 0.0002 seconds (0.2 milliseconds). It is found that impacts typically have damped oscillatory waveshapes, and can interfere with each other to either add or subtract at a particular location on the base 304 . When the periods of the damped oscillations from the impacts are close to the time difference due to path lengths X 1 and X 2 , the initial oscillations (which are largest) can add at the mounting pad 310 and damage the micromechanical assembly 309 .
- the second rail corner 336 has its shape adjusted to control relative times at which impacts reach the micromechanical device 309 which is mounted to the mounting pad 310 .
- a portion of the second rail 332 includes an elevational step 364 , which is shown enlarged in FIGS. 6–8 for clarity.
- the elevational step 364 thins a portion of the second rail 332 .
- the elevational step 364 extends to the second rail corner 336 .
- the elevational step 364 is adjusted so the rail corners 334 , 36 are uneven and so that impacts at the first rail corner 334 and the second rail corner 336 are not simultaneous.
- the magnitude of the step is adjusted so that the impacts from the rail corners 334 , 336 tend to have a cancellation effect when the impacts reach the mounting pad 310 .
- This cancellation reduces the peak amplitudes of the impacts on the micromechanical assembly 309 and reduces impact damage.
- the first rail corner 334 has a first corner elevation 340 and the second rail corner 336 has a second rail corner elevation 341 .
- a spacing difference between the first and second rail corner elevations controls the relative times of impacts. In a preferred arrangement, the spacing difference is in the range of 0.125–0.250 millimeters (0.005 to 0.010 inch). Only shaping of a rail end is needed, and there is no need to add additional components to the assembly. 300 to protect the micromechanical device 309 from this kind of shock damage.
- FIG. 9 illustrates a graph of accelerations due to impact on an assembly with an elevational unevenness between rail corners.
- the data in FIG. 9 is comparable to the data in FIG. 5 .
- a vertical axis 370 represents acceleration as sensed by three accelerometers mounted to the disc drive.
- a horizontal axis 372 represents time in seconds.
- a solid line 374 represents acceleration sensed at a first (left) rail corner.
- a coarsely dashed line 376 represents acceleration sensed at a second (right) rail corner.
- a finely dashed line 378 represents acceleration sensed at a mounting pad (actuator arm pivot).
- FIG. 9 there are impact (acceleration) peaks 380 , 382 at the rail corners that are not simultaneous, but are instead spaced apart in time due to elevational unevenness.
- the impact peaks 380 , 382 travel through a base to the mounting pad and interfere to provide cancellation at the mounting pad.
- There is no large impact peak at the mounting pad such as impact peak 284 described above in connection with FIG. 5 .
- FIGS. 10–12 schematically illustrate a second embodiment of an assembly 400 with an elevational step on a rail corner to provide unevenness.
- Reference numbers used in FIGS. 10–12 that are the same as reference numbers used in FIGS. 6–8 identify the same or similar features.
- the rail ends 334 , 336 are shaped to also include mounting lugs 402 , 406 .
- the lugs 402 , 406 surround threaded holes 404 , 408 which are mounting holes for mounting the assembly 400 to a mounting surface (not illustrated).
- the lug 402 includes the elevational step 364 and does not interfere with the advantages of unevenness and impact cancellation at the mounting pad 310 described above in connection with FIGS. 6–9 .
- the lugs 402 , 406 do not protrude above the level of the adjacent rail ends 334 , 336 .
- the rail ends 334 , 336 which are shaped to be uneven, impact a flat surface at different times.
- the assembly 400 in FIGS. 10–12 is similar to the assembly 300 in FIGS. 6–8 .
- FIGS. 13–15 illustrate a third embodiment of an assembly 500 with first and second lugs 501 , 503 that are attached to the first and second rail corners 334 , 336 .
- Reference numbers used in FIGS. 13–15 that are the same as reference numbers used in FIGS. 10–12 identify the same or similar features.
- Grooves 550 , 552 undercut the first and second lugs 501 , 503 such that the first and second lugs 501 , 503 are cantilevered over the base 304 , without cutting a groove in the main bodies of rails 330 , 332 themselves.
- the first and second lugs 501 , 503 protrude above the first and second rail corners 334 , 336 .
- a housing 502 comprises a metal die casting and the cantilevered, protruding lugs 501 , 503 and the first and second side rails 330 , 332 are portions of the die casting.
- the cantilevered first and second lugs 501 , 503 are deflectable and spread the impulses over time.
- the deflectable first and second lugs 501 , 503 reduce or lower peak values of the impulses.
- the first and second lugs 501 and 502 have corresponding first and second elevations 540 , 541 that protrude beyond a rail elevation 542 to provide unevenness.
- the elevations 540 , 541 can be the same elevation or can be elevations that are different from one another to provide unevenness.
- the assembly 500 in FIGS. 13–15 is similar to the assembly 400 in FIGS. 10–12 .
- FIG. 17 illustrates a graph of accelerations due to impact on an assemblies with and without protruding, cantilevered lugs on a rail corner.
- the data in FIG. 17 is comparable to the data in FIGS. 5 , 9 .
- a vertical axis 570 represents acceleration as sensed by an accelerometers mounted at mounting pads in the disc drive housings.
- a horizontal axis 572 represents time in seconds.
- a first line 574 (identified with circular dots) represents acceleration sensed without the use of protruding undercut lugs.
- a second line 576 (identified with rectangles) represents acceleration sensed with the use of protruding cantilevered lugs.
- an impact (acceleration) peak 578 is present when the protruding cantilevered lugs are not used. There is no corresponding large impact peak when the protruding cantilevered lugs are used. In FIG. 17 , there is no impact peak large enough to damage a micromechanical device mounted to the mounting pad when the protruding, cantilevered lugs are used. Referring back to the graph in FIG. 5 , it can be seen that in FIG. 5 where the rail corners are not shaped to limit shock, there is an impact peak 284 large enough to damage a micromechanical device. Referring back to the graph in FIG.
- FIGS. 18 illustrates a partial view of a fourth embodiment of an assembly 600 with protruding, undercut lugs, only one of which is illustrated in FIG. 18 .
- the lug 602 includes a threaded hole 604 for receiving a mounting screw.
- the lug 602 has an external surface 606 that protrudes above an elevational step 608 in a rail 610 .
- the lug 602 is undercut by a slot 612 so that the lug 602 is cantilevered over a base 614 .
- the arrangement of the elevational step 608 and the slot 612 form a region 614 that is flexible and functions as a solid state hinge for the lug 602 . When the lug 602 strikes a surface, the region 614 flexes.
- the flexing spreads the impact out over time and reduces the peak magnitude of acceleration that reaches a mounting pad 618 .
- the side rail 610 is mounted to the base 614 that is part of a housing 616 .
- the mounting pad 618 is also mounted to the base 614 and serves as a mounting point for an acceleration-sensitive micromechanical assembly that is protected from shock by the protruding, undercut lugs.
- the impact absorber design feature significantly reduces the chance of damaging the drive when dropped during manufacturing and customer integration handling.
- the mounting lug 602 has a elevation 640 and the elevational step 608 has an elevation 642 that is different than elevation 640 to provide unevenness.
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Abstract
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Claims (27)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/865,337 US7218474B2 (en) | 2004-06-10 | 2004-06-10 | Assembly rail corners shaped to reduce shock |
Applications Claiming Priority (1)
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US10/865,337 US7218474B2 (en) | 2004-06-10 | 2004-06-10 | Assembly rail corners shaped to reduce shock |
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US20050275966A1 US20050275966A1 (en) | 2005-12-15 |
US7218474B2 true US7218474B2 (en) | 2007-05-15 |
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US10/865,337 Expired - Fee Related US7218474B2 (en) | 2004-06-10 | 2004-06-10 | Assembly rail corners shaped to reduce shock |
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Cited By (1)
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US20070070596A1 (en) * | 2005-09-29 | 2007-03-29 | Seagate Technology Llc | Housing with a rail shaped to reduce impact damage |
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US8300352B1 (en) | 2009-06-18 | 2012-10-30 | Western Digital Technologies, Inc. | Disk drive having mounting inserts with cantilevered beams |
KR20130015889A (en) * | 2011-08-05 | 2013-02-14 | 삼성전기주식회사 | Base for motor and hard disk drive including the same |
US8705201B2 (en) | 2011-12-20 | 2014-04-22 | Western Digital Technologies, Inc. | Information storage device with a damping insert sheet between a housing bay and a disk drive |
US8462460B1 (en) | 2012-03-29 | 2013-06-11 | Western Digital Technologies, Inc. | Shock mount and retainer for a disk drive enclosure |
US8547658B1 (en) | 2012-10-18 | 2013-10-01 | Western Digital Technologies, Inc. | Data storage device enclosure enabling use of a common shock mount across different products |
US9360900B1 (en) | 2013-08-21 | 2016-06-07 | Western Digital Technologies, Inc. | Captivating shock mounts for data storage devices using retention clips |
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US6545865B2 (en) | 2001-07-13 | 2003-04-08 | International Business Machines Corporation | Shock mount for a device packaged in a portable cartridge |
US7012805B2 (en) * | 2003-07-16 | 2006-03-14 | Olixir Technologies | Ruggedized host module |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070070596A1 (en) * | 2005-09-29 | 2007-03-29 | Seagate Technology Llc | Housing with a rail shaped to reduce impact damage |
US7420774B2 (en) * | 2005-09-29 | 2008-09-02 | Seagate Technology Llc | Housing with a rail shaped to reduce impact damage |
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